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3 results on '"Jianyuan Teng"'

1. Alleviating effects and mechanisms of action of large-leaf yellow tea drinking on diabetes and diabetic nephropathy in mice

Author

Guangshan Zhao, Jianyuan Teng, Ruixia Dong, Qiuyan Ban, Lian Yang, Kang Du, Yifei Wang, Hanlin Pu, Chung S. Yang, and Zhe Ren

Subjects
Diabetes, Glucose and lipid metabolism, Gut microbiota, Diabetic nephropathy, Large-leaf yellow tea, Nutrition. Foods and food supply, TX341-641
Abstract

Our previous study found that large-leaf yellow tea (LYT) had interesting hypoglycemic activity in high-fat diet-induced obese mice and highly safety in healthy mice. To study the anti-diabetic potential of LYT, the present study further investigated the preventive effects and mechanisms of action of LYT administration on diabetes and diabetic nephropathy in high-fat diet plus streptozotocin-induced diabetic mice. Results showed that LYT infusions (1/100 and 1/50, m/V) as drinking fluid for 4 weeks reduced diabetic polydipsia and polyuria, enhanced glucose tolerance and insulin sensitivity, and lowered fasting blood glucose level. The underlying mechanisms involve downregulation of gluconeogenesis (lower protein levels of TXNIP and FBP and enzyme activity of FBP), upregulation of lipid catabolism (higher protein levels of CPT-1α and PPARα), downregulation of lipogenesis (lower protein level of SREBP-1), and modification of the structure and abundance of gut microbiota to modulate metabolic homeostasis. Moreover, LYT administration prevented diabetic nephropathy, possibly due to reduced glucose-caused osmotic diuresis and lowered levels of renal PKC-β2, NLRP3 as well as membrane PKC-α, AQP2 and glycosylated AQP2 proteins. Taken together, LYT exhibits the activities in alleviating diabetic symptoms, ameliorating glucose and lipid dysmetabolism and fatty liver, and preventing diabetic nephropathy in diabetic mice. These activities may be explored for the prevention and treatment of diabetes in humans.

Published
2023
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3. N‑Acetyl‑l‑cysteine Enhances the Effect of Selenium Nanoparticles on Cancer Cytotoxicity by Increasing the Production of Selenium-Induced Reactive Oxygen Species

Author

Ximing Wu, Ruixia Dong, Lian Yang, Zhiping Wang, Tao Liu, Hanlin Pu, Guangshan Zhao, Jianyuan Teng, Yufeng He, and Wang Yifei

Subjects
chemistry.chemical_classification, Cisplatin, Reactive oxygen species, General Chemical Engineering, medicine.medical_treatment, Intraperitoneal injection, General Chemistry, Glutathione, Pharmacology, Protein degradation, Article, chemistry.chemical_compound, Chemistry, chemistry, Apoptosis, Cancer cell, medicine, Cytotoxicity, QD1-999, medicine.drug
Abstract

Peritoneal carcinomatosis (PC) has an extremely poor prognosis, which leads to a significantly decreased overall survival in patients with peritoneal implantation of cancer cells. Administration of sodium selenite by intraperitoneal injection is highly effective in inhibiting PC. Our previous study found that selenium nanoparticles (SeNPs) have higher redox activity and safety than sodium selenite. In the present study, we examined the therapeutic effect of SeNPs on PC and elucidated the potential mechanism. Our results revealed that intraperitoneal delivery of SeNPs to cancer cells in the peritoneal cavity of mice at a tolerable dose was beneficial for prolonging the survival time of mice, even better than the optimal dose of cisplatin. The underlying mechanism involved in SeNP-induced reactive oxygen species (ROS) production caused protein degradation and apoptotic response in cancer cells. Interestingly, N-acetyl-l-cysteine (NAC), recognized as a ROS scavenger, without reducing the efficacy of SeNPs, enhanced ROS production and cytotoxicity. The effect of NAC was associated with the following mechanisms: (1) the thiol groups in NAC can increase the biosynthesis of endogenous glutathione (GSH), thus increasing the production of SeNP-induced ROS and cytotoxicity and (2) redox cycling of SeNPs was directly driven by thiol groups in NAC to produce ROS. Moreover, NAC, without increasing the systematic toxicity of SeNPs, decreased SeNP-induced lethality in healthy mice. Overall, we demonstrated that SeNPs exert a potential cytotoxicity effect by inducing ROS production in cancer cells; NAC effectively heightens the property of SeNPs in vitro and in vivo.

Published
2020

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